Effect of dodecyl betaine on the degradation of C.I.Reactive Black 5 by thermally activated sodium persulfate
To illustrate the influence of zwitterionic surfactants on the degradation of dye wastewater by thermally activated sodium persulfate(SPS),C.I.Reactive Black 5(RB5)and dodecyl betaine(BS-12)were identified as research subjects to study the effects of BS-12,SPS and temperature on the degradation of RB5.It revealed the relationship between the degradation effect of RB5 and the type of free radicals,and explained the possible degradation pathways of RB5.The results showed that the critical micelle concentration(CMC)of BS-12 in the dye solution was 0.03mmol/L.The concentration of BS-12 affected the rate of RB5 decolorization in the initial stage,but did not change the degree of final decolorization.Compared with the decolorization of the dye solution without BS-12 for 10min,the addition of 0.5CMC BS-12 increased the decolorization rate by 10.45%,while 5CMC BS-12 decreased the decolorization rate by 14.72%.In the thermally activated SPS-degraded RB5 system,dye degradation was attributed to the synergistic effect of·SO4-and·OH,but·SO4-dominated.Under the synergistic action of free radicals,the—N==N—and C—N bonds in RB5 were opened to form intermediates containing benzene and naphthalene rings,and the addition of BS-12 was detrimental to the degradation of RB5 when the concentration of free radicals was low.
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